Zyxel addressed two critical buffer overflow vulnerabilities, tracked as CVE-2023-33009 and CVE-2023-33010, that affect several of its firewall and VPN products.
A remote, unauthenticated attacker can can trigger the flaws to cause a denial-of-service (DoS) condition and remote code execution on vulnerable devices.
Below are the description for both issues provided by the vendor in a security advisory:
Users are recommended to install security updates provided by the company to address the issues.
The following table includes vulnerable devices:
Affected series | Affected version | Patch availability |
---|---|---|
ATP | ZLD V4.32 to V5.36 Patch 1 | ZLD V5.36 Patch 2 |
USG FLEX | ZLD V4.50 to V5.36 Patch 1 | ZLD V5.36 Patch 2 |
USG FLEX50(W) / USG20(W)-VPN | ZLD V4.25 to V5.36 Patch 1 | ZLD V5.36 Patch 2 |
VPN | ZLD V4.30 to V5.36 Patch 1 | ZLD V5.36 Patch 2 |
ZyWALL/USG | ZLD V4.25 to V4.73 Patch 1 | ZLD V4.73 Patch 2 |
At the end April, Zyxel fixed a critical RCE flaw, tracked as CVE-2023-28771 (CVSS score 9.8), in its firewall devices and urged customers to install the patches.
The company also fixed a high-severity post-authentication command injection issue (CVE-2023-27991, CVSS score: 8.8) affecting some specific firewall versions.
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